21851674 has 32 divisors (see below), whose sum is σ = 37109520. Its totient is φ = 9580032.

The previous prime is 21851671. The next prime is 21851689. The reversal of 21851674 is 47615812.

It can be written as a sum of positive squares in 8 ways, for example, as 9566649 + 12285025 = 3093^2 + 3505^2 .

It is not an unprimeable number, because it can be changed into a prime (21851671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54844 + ... + 55240.

Almost surely, 2^21851674 is an apocalyptic number.

21851674 is a deficient number, since it is larger than the sum of its proper divisors (15257846).

21851674 is a wasteful number, since it uses less digits than its factorization.

21851674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514.

The product of its digits is 13440, while the sum is 34.

The square root of 21851674 is about 4674.5774140557. The cubic root of 21851674 is about 279.5727924007.

The spelling of 21851674 in words is "twenty-one million, eight hundred fifty-one thousand, six hundred seventy-four".